Thread spool



FIG. 1 is a Perspective view of a thread spool showing my new design;

FIG. 2 is other Perspective view thereof;

FIG. 3 is another front view thereof;

FIG. 4 is a Front view thereof;

FIG. 5 is a Back view thereof;

FIG. 6 is a Left-side view thereof;

FIG. 7 is a Right-side view thereof;

FIG. 8 is a Top view thereof; and,

FIG. 9 is a Bottom view thereof.

The broken lines represent an environment of use and form no part of the claim. 

CLAIM I claim the ornamental design for a thread spool, as shown and described. 